[X86] Refactor the SSE intrinsics constexpr tests to simplify future expansion (#112578) I'm hoping to make a large proportion of the SSE/AVX intrinsics usable in constant expressions - eventually anything that doesn't touch memory or system settings - making it much easier to utilize SSE/AVX intrinsics in various math libraries etc. My initial implementation placed the tests at the end of the test file, similar to how smaller files already handle their tests. However, what I'm finding is that this approach doesn't scale when trying to track coverage of so many intrinsics - many keep getting missed, and it gets messy; so what I'm proposing is to instead keep each intrinsic's generic IR test and its constexpr tests together to make them easier to track together, wrapping the static_assert inside a macro to disable on C and pre-C++11 tests. I'm open to alternative suggestions before I invest too much time getting this work done :)
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